Davis said there is no evidence to suggest that there is a second person involved in the murder or the attacks.

Kayleigh Ballantyne, one of the two women allegedly attacked by Alemany, says she was stabbed several times early Wednesday morning on Gates Street. She was able to kick the knife out the attacker’s hands. She later identified Alemany when she was being treated at the hospital. Ballantyne is in stable condition.

Another woman, who was attacked on Old Colony Ave. Tuesday morning, told police that Alemany said to her, “I’m not robbing you I’m going to kill you.” Then he looked at her and said, “you’re not the one I’m looking for, I’m sorry. I have a hit out for a female pushing a baby carriage.”

WBZ has learned that Alemany is also connected to another alleged assault on a woman in Roxbury last September.

A police report obtained by WBZ-TV shows the woman told officers a man attacked her from behind. When she regained consciousness from the attack, she had a wallet in her possession that had an ID belonging to Alemany.

In a press conference Friday, Commissioner Davis said the department is opening an internal affairs investigation into the 2012 attack to determine why an arrest was not made. Davis said it was clear that there was probable cause linking Alemany to that attack.

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Alemany has a lengthy criminal record, and has been arrested 17 times by Boston Police dating back to when he was 14 years old. His first arrest was for armed breaking and entering and destruction of personal property at a Roslindale home in 1999.

“As you can imagine, it’s incredibly frustrating that we are here today talking about a man that has 18 juvenile arraignments, and 34 adult arraignments and is still not incarcerated,” Commissioner Davis said.